The idea of socialism gradually gained ground in India’s National Movement. The Russian revolution had made a deep impact on the thinking of many nationalist leaders. The most outstanding of these leaders were Jawaharlal Nehru and Subhas Chandra Bose.
In 1920, M.N. Roy at Tashkent announced the formation of Communist Party of India. In India, in 1924 Satyabhakta announced that he had formed the Communist Party of India with himself as the Secretary.
The Communists were involved in the Peshwar, Kanpur and Meerut conspiracy trials.
In 1934, CPI was declared illegal organisation.
In 1934, Jaiprakash Narayan and others founded the Congress Socialist Party.
In 1942, the CPI adopted a resolution declaring India to be a multinational State and identifying as many as 16 Indian nations.
Subhas Chandra Bose formed the Forward Block in 1939.